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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ec418f0255319a9961ee439eca661c4e9ad801d21aaa9ac1a65469d8392a18' 
  AND token = 'EYtCw468cYKQ0QnZZnYUow4U7lBxZyA4sK+1EkIBv1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}